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If you validate the url you get several XML errors like this: XML Parsing Error: attributes construct error. Other Validators says - the page is Ok. I mean tidy and the HTML Validator 0.8.4.0 with sglm parsing. Cynthia says it is a valid WCAG Priority 1,2,3 Document.
name="pw_kontakt_AnfahrtDay"id="id1" needs a space between the attributes (something sgml-based validators will not catch, but is the rule in XML and thus XHTML).